---
slug: "letta"
name: "Letta"
effect: "Runs stateful agents that keep memory and identity across sessions and rewrite their own memory over time"
category: "memory"
tier: "rising"
url: "https://www.letta.com"
github: "letta-ai/letta-code"
pricing: "open-source"
license: "Apache-2.0"
tags: ["stateful-agents", "cli", "typescript", "desktop-app", "self-improving"]
platforms: ["macos", "windows", "linux", "web"]
install_kind: "npm"
date_added: "2026-10-14"
rank: 28
rising_score: 36
stars: 3614
star_velocity: 10.2
velocity_basis: "since creation"
created_at: "2025-10-25T04:17:51Z"
pushed_at: "2026-10-15T05:02:39Z"
signals_status: "ok"
signals_fetched_at: "2026-10-15T05:02:44.524Z"
page: "https://agenttooldrop.com/tools/letta"
---

# Letta

Runs stateful agents that keep memory and identity across sessions and rewrite their own memory over time

Category: Memory. Tier: new and rising, rank 28 by new and rising score (36 of 100). Pricing: Open source. License: Apache-2.0.

Platforms: macos, windows, linux, web.

## Why you would want it

Letta (formerly MemGPT) is now built as Letta Code, an agent harness whose agents keep memory, identity and conversation history and improve by rewriting their own memory blocks, skills and prompts. All context, including memory blocks, is tracked in git (MemFS), and agents can search past messages, call subagents and run on schedules. You reach the same agent from a terminal UI, a desktop app for macOS, Windows and Linux, chat.letta.com, or Slack, Telegram and Discord, with agent state stored in Letta Cloud or kept local.

## Best for

- Long-running personal or team agents
- Agents that should learn from past sessions
- Using one agent across terminal, desktop and chat apps

## Use it when

You want a ready-made agent that remembers and adapts over long periods, rather than a memory library to wire into your own agent.

## Skip it if

You need the older Letta V1 API server, which is retired to the repo's archive branch. Letta Cloud is the default backend, and remote computers and secrets require signing in with Letta.

## Editor note

The letta-ai/letta repo now only points to letta-ai/letta-code, where current development happens and which this entry tracks; the V1 server is on the old repo's archive branch.

## Install

Install with npm:

```sh
npm install -g @letta-ai/letta-code
```

Source: https://github.com/letta-ai/letta#readme

## Live signals

Fetched 2026-10-15T05:02:44.524Z (status: ok).

- Repository: letta-ai/letta-code
- Repository created: 2025-10-25
- Stars: 3,614 (GitHub's count; it cannot be authenticated)
- Stars per day, since repo creation: 10.2 (an average over the repo's life, not a growth rate)
- Forks: 439
- Open issues and PRs: 523
- License (GitHub): Apache-2.0
- Last push: 2026-10-15
- Latest release: v0.34.14 (2026-10-14)

## Links

- Website: https://www.letta.com
- GitHub: https://github.com/letta-ai/letta-code
- Install instructions verified at: https://github.com/letta-ai/letta#readme
- Source for this entry: https://github.com/letta-ai/letta-code#readme
- AgentToolDrop page: https://agenttooldrop.com/tools/letta
- Full catalog (JSON): https://agenttooldrop.com/tools.json